MUSCULAR AND SKELETAL ENHANCEMENTS

As a Spartan-IV, your bones will be lengthened by several centimeters and strengthened with Titanium-A and composite sheathing. Your muscles will then be reattached and woven with synthetic poly-muscle fibers similar to those used in your exoskeleton suit, which contract with enough force to shatter your original skeleton.

 - Spartan Field Manual Pg 24

Titanium-A Battleplate

Human warships are armoured with thick layers of molecularly-reinforced titanium, elastic polymers, and intermetallic laminate that mitigate damage from both directed energy and kinetic attacks. The space between the armour plates is filled with shock-hardening fluids and encapsulated healing agents to reduce spall from impacts and automatically seal small hull breaches.

 - Halo: Warfleet Pg 19